If a * b = a² + b² − ab, then value of 8 * 7 − 3 * 5 is :यदि a * b = a² + b² − ab, तो 8 * 7 − 3 * 5 का मान है :

1. A41
2. B58
3. C64
4. D38

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Correct answer: D. 38

Explanation

8 * 7 = 64 + 49 − 56 = 57 and 3 * 5 = 9 + 25 − 15 = 19. So 57 − 19 = 38.8 * 7 = 64 + 49 − 56 = 57 तथा 3 * 5 = 9 + 25 − 15 = 19। अतः 57 − 19 = 38।